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问题
单项选择题
在自动控制系统中，（）是实现自动控制的首要环节。
A、输出
B、检测
C、输入
D、驱动
答案
参考答案：
B
选择题
I waited for him nearly a whole morning _____ he didn't even bother to call me to tell that he had changed his mind.
A. during which
B. during when
C. where
D. which
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问答题 简答题
两站整零车为什么规定第一到站货物不少于货车标重的20%，第二到站不少于40%？
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